Tiger Cardinalfish (Cheilodipterus macrodon). What you can see in its mouth are its eggs if you look closely and zoom in. Males incubate their eggs inside their mouths, as the egg masses increase in size they can be found with wide open mouths where they shift the eggs around to aerate the egg masses. Taken by #Underwaterphotographer #DanielSasse #yourshotphotographer #Scubadiving #Aonang #Krabi #photooftheday #Marinelifeprotection #Ouroceans #Underwaterphotography #natgeo #nature #uwpic #Savetheoceans #Marineconservation #Oceandefender #Saveourseas #underwaterlife #fish #ecowarrior #natgeowild